Diseases

Evaluation of Preventative Fungicides for Control of Summer Patch of Poa Caused by Magnaporthe poae

Summary: In a replicated field trial at Arrowhead Country Club, San Bernardino, CA, monthly preventative treatments of Heritage at 0.2 and 0.4 oz/1000 sq ft and Lynx at 1.5 oz/1000 sq ft provided good to excellent control of summer patch compared to monthly applications of Bayleton at 4.0 oz/1000 sq ft or the non-treated control plots. Heritage and Lynx also provided significantly improved turfgrass quality compared to the Bayleton and non-treated plots, although Lynx applications did result in significant, but reversible damage to turf. Bayleton turfgrass quality and control ratings were not significantly higher than the non-treated control plots on many of the rating dates. Based upon these results, Heritage or Lynx would be good replacements for the commercial standard Bayleton. Due to their solid performance, as well as their high residual activity, the use of Heritage or Lynx should also result in fewer pesticide applications per season for control of summer patch.

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Principal Investigators: Wendy Gelernter, Ph.D. and Larry J. Stowell, Ph.D., CPPP, CPAg

Cooperator: John Harkness, Arrowhead Country Club

Sponsors: Gary Braness, Bayer and David Ross, Zeneca

Evaluation of ABG-9008 for Control of Nematode Damage to Golf Course Greens

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Summary: A study was conducted on annual bluegrass golf course greens in three locations to evaluate the efficacy of two different formulations of ABG-9008 applied at two different rates for control of the damage caused by parasitic nematodes on turf. A significant (P<0.10) decrease in Criconemella populations was observed in one location, on one sampling date, but no other consistent trends towards improved turfgrass quality or reduction of parasitic nematode populations (including the ring nematode, Criconemella, the spiral nematode, Helicotylenchus, the root-knot nematode, Meloidogyne, and the stunt nematode, Tylenchorhynchus) were seen. Inexplicable, but significant (P<0.10) increases in the numbers of Helicotylenchus and Meloidogyne were observed at one location each following treatment with ABG-9008. Further lab and/or greenhouse studies may be required to understand the basis of these somewhat inconsistent results.

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Investigators: Wendy Gelernter, Ph.D. and Larry J. Stowell, Ph.D., CPAg

Cooperators: Gary Dalton, San Diego Country Club, John Harkness, Arrowhead Country Club, John Martinez, SCGA Members Club at Rancho California

Sponsor: Gary Kirfman, Abbott Laboratories